CN110387490B - Cast aluminum-silicon alloy with high heat conductivity and preparation method thereof - Google Patents
Cast aluminum-silicon alloy with high heat conductivity and preparation method thereof Download PDFInfo
- Publication number
- CN110387490B CN110387490B CN201910701114.1A CN201910701114A CN110387490B CN 110387490 B CN110387490 B CN 110387490B CN 201910701114 A CN201910701114 A CN 201910701114A CN 110387490 B CN110387490 B CN 110387490B
- Authority
- CN
- China
- Prior art keywords
- alloy
- cast aluminum
- silicon alloy
- thermal conductivity
- aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000676 Si alloy Inorganic materials 0.000 title claims abstract description 67
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 77
- 239000000956 alloy Substances 0.000 claims abstract description 77
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 229910052796 boron Inorganic materials 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000011777 magnesium Substances 0.000 claims description 38
- 229910052749 magnesium Inorganic materials 0.000 claims description 26
- 239000011701 zinc Substances 0.000 claims description 25
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 20
- 229910018125 Al-Si Inorganic materials 0.000 claims description 17
- 229910018520 Al—Si Inorganic materials 0.000 claims description 17
- 229910018182 Al—Cu Inorganic materials 0.000 claims description 14
- -1 aluminum-titanium-boron Chemical compound 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000005275 alloying Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- VHHHONWQHHHLTI-UHFFFAOYSA-N hexachloroethane Chemical compound ClC(Cl)(Cl)C(Cl)(Cl)Cl VHHHONWQHHHLTI-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 6
- 238000004891 communication Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 22
- 239000006104 solid solution Substances 0.000 description 20
- 239000010949 copper Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 12
- 239000000243 solution Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 5
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 229910016343 Al2Cu Inorganic materials 0.000 description 1
- 229910018464 Al—Mg—Si Inorganic materials 0.000 description 1
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 229910017706 MgZn Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Continuous Casting (AREA)
- Conductive Materials (AREA)
Abstract
本发明公开了一种高导热性能铸造铝硅合金及其制备方法，该高导热性能铸造铝硅合金由以下重量百分比含量的元素组成：Si:3.3%‑5.5%，Cu:0.1%‑0.40%，Mg:0.26%‑0.70%，Zn:0.04%‑0.1%，Ti：0.05%‑0.2%，B：0.05%‑0.2%，其他杂质总量和不大于0.02%，余量为Al。本发明元素在特定合金成分组成配比的条件下通过特定工艺步骤进行有效结合，可一次性成型制得导热率达172‑190W/(m∙k)的铸造铝硅合金，实现在良好铸造性能、力学性能和热处理性能的基础上，显著提高了铸造铝硅合金的导热性能。本发明制备的高导热性能铸造铝硅合金具有重要的应用价值，可广泛应用于汽车、通信及电子设备领域，还可用于导热装置、散热壳等，其优良的传热效率可促进能源的有效利用，降低能耗。The invention discloses a high thermal conductivity cast aluminum silicon alloy and a preparation method thereof. The high thermal conductivity cast aluminum silicon alloy is composed of the following elements by weight: Si: 3.3%-5.5%, Cu: 0.1%-0.40% , Mg: 0.26%-0.70%, Zn: 0.04%-0.1%, Ti: 0.05%-0.2%, B: 0.05%-0.2%, the total sum of other impurities is not more than 0.02%, and the balance is Al. The elements of the present invention are effectively combined through specific process steps under the condition of specific alloy composition ratio, and can be formed into a cast aluminum-silicon alloy with a thermal conductivity of 172-190W/(m∙k) at one time, so as to achieve good casting performance. On the basis of , mechanical properties and heat treatment properties, the thermal conductivity of cast aluminum-silicon alloys is significantly improved. The cast aluminum-silicon alloy with high thermal conductivity prepared by the invention has important application value, can be widely used in the fields of automobiles, communications and electronic equipment, and can also be used in heat-conducting devices, heat-dissipating shells, etc., and its excellent heat-transfer efficiency can promote the efficient use of energy. use to reduce energy consumption.
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a cast aluminum-silicon alloy with high heat conductivity and a preparation method thereof.
Background
Pure Al has a thermal conductivity of 237W/(m.K) next to that of Au, Ag and Cu. Al has the advantages of low price, low specific gravity, easy surface treatment, high content in the crust and the like. The Al-Si alloy is an important casting alloy, and has the advantages of environmental protection, excellent casting performance, strong welding performance, good fluidity, good electric and thermal conductivity, long life cycle, high recycling rate and the like, so the Al-Si alloy is widely applied to the field of heat dissipation parts. With the development of the communication industry and electronic devices, some electronic products, LED lighting devices, heat dissipation housings for communication base stations, etc. tend to be miniaturized and light-weighted, and with the increase of power density, the demand for heat dissipation performance is increasing, so that it is urgently needed to develop a material with high heat conductivity to meet the requirement of high heat dissipation of devices.
Currently, the most commonly used aluminum-silicon alloys mainly include the series ZL101 and ZL102, which have a thermal conductivity of 121W/(m · K) in an as-cast state, a tensile strength of about 130MPa, a thermal conductivity of 148W/(m · K) after heat treatment, and a tensile strength of about 230 MPa. In the conventional die-casting aluminum alloy ADC12, the content of silicon is 12 percent of the eutectic point, the thermal conductivity of the alloy in the casting state is only 96W/(m.K), and the thermal conductivity of the alloy is different from that of the Al-Mg-Si wrought aluminum alloy.
Therefore, the heat conductivity of the Al-Si cast aluminum alloy is improved, the industrial application range of the cast Al-Si alloy is expanded, the metal mold casting process with lower processing cost is realized to replace the extrusion section machining process with higher processing cost, and the high heat conduction cast Al-Si alloy with good performance and low cost is more and more required by people.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provide a high-heat-conductivity cast aluminum-silicon alloy which has good casting performance and heat treatment performance and also has high heat conductivity.
The invention also aims to provide a preparation method of the cast aluminum-silicon alloy with high heat conductivity.
In order to achieve the purpose, the invention adopts the following technical scheme: a cast aluminum-silicon alloy with high heat conductivity is composed of the following elements by weight percent: 3.3 to 5.5 percent of Si, 0.1 to 0.40 percent of Cu, 0.26 to 0.70 percent of Mg, 0.04 to 0.1 percent of Zn, and the weight ratio of Ti: 0.05% -0.2%, B: 0.05-0.2 percent, the sum of other impurities is not more than 0.02 percent, and the balance is Al.
A preparation method of cast aluminum-silicon alloy with high heat conductivity comprises the following steps:
1) drying: pure aluminum ingots, Al-Si intermediate alloys, Al-Cu intermediate alloys, magnesium ingots, zinc ingots and aluminum-titanium-boron refiners are selected as raw materials according to the element composition, and the raw materials are dried;
2) smelting: firstly, melting a pure aluminum ingot, adding an Al-Si intermediate alloy when the temperature of the pure aluminum liquid reaches 850-900 ℃, adding the Al-Si intermediate alloy after the Al-Si intermediate alloy is completely melted, standing for 15-20min after the Al-Cu intermediate alloy is completely melted, adding a magnesium ingot after standing, adding a zinc ingot after the magnesium ingot is completely melted, and standing to obtain an alloy melt after the zinc ingot is completely melted;
3) alloying: when the temperature of the alloy melt is reduced to 720-750 ℃, adding an aluminum-titanium-boron refiner into the alloy melt, fully stirring, then removing slag by using hexachloroethane, and pouring when the temperature of the alloy melt is reduced to 710-720 ℃ to obtain cast aluminum-silicon alloy;
4) and (3) heat treatment: and carrying out solid solution treatment on the cast aluminum-silicon alloy, and carrying out quenching treatment on the cast aluminum-silicon alloy after solid solution treatment to obtain the cast aluminum-silicon alloy with high heat conductivity.
Further, in the step 1), drying treatment is carried out on each raw material under the temperature condition of 100 ℃.
Further, the purities of the pure aluminum ingot, the magnesium ingot and the zinc ingot in the step 1) are all more than 99.5%.
Further, a well-type crucible resistance furnace is adopted for smelting in the step 2).
Further, the deslagging time in the step 3) is 5-10 min.
Further, the casting in the step 3) is poured into a metal mold with the preheating temperature of 200 ℃.
Further, the solid solution temperature in the step 4) is 500-540 ℃, and the solid solution time is 8 hours.
Further, the sample after solid solution in the step 4) is quenched in warm water at 33-37 ℃, and the quenching time is less than 10 s.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, silicon in the composition of the high-heat-conductivity cast aluminum-silicon alloy can be used as an alloy element to improve the casting performance and the mechanical property of the alloy, but with the increase of the content of the silicon element, the excessive silicon element is dissolved in an aluminum matrix on one hand, and forms a coarse beta phase with aluminum on the other hand, so that the heat conductivity of the aluminum alloy is reduced, the heat conductivity is reduced, and the silicon element is found to be controlled within the range of 3.3-5.5% through system research and comparison of the alloy components. Copper and magnesium as alloy elements can be combined with silicon to realize aging strengthening to respectively form Al2Cu、Mg2The Si strengthening phase, however, is dissolved into the aluminum matrix in an increased amount with the increase of the contents of copper and magnesium, causing an increase in the degree of lattice distortion and a decrease in thermal conductivity, so that the contents of Cu and Mg should be limited within the range of 0.10% to 0.40% Cu and 0.26% to 0.70% Mg by systematic study of alloy components and comparison in order to achieve the best combination of mechanical properties and thermal conductivity. The addition of zinc can improve the fluidity and castability of the aluminum alloy, increase the strength and corrosion resistance of the alloy, and form eta (MgZn) when zinc and magnesium coexist2) And T (Al)2Mg2Zn3) The phases eta and T have high solubility in Al, so that an aluminum matrix has serious lattice distortion, the regularity of an ionic electric field is damaged, the resistance of moving electrons is increased, the mean free path of the electrons is increased, and finally the thermal conductivity is reduced, so that on the basis of ensuring the fluidity of the alloy, the systematic research on the alloy components and the content of the comparative zinc are limited within the range of 0.04-0.1 percent of Zn. The elements are effectively combined through specific process steps under the condition of specific alloy component proportion, the cast aluminum-silicon alloy with the thermal conductivity of 172-. The cast aluminum-silicon alloy with high heat conductivity prepared by the invention has important application value, can be widely applied to the fields of automobiles, communication and electronic equipment, and can also be applied to heat conduction devices, heat dissipation shells and the like, and the excellent heat transfer efficiency can promote the effective utilization of energy and reduce energy consumption.
2. According to the invention, when the high-heat-conductivity cast aluminum-silicon alloy is prepared, raw materials are selected according to element compositions, and then the high-heat-conductivity cast aluminum-silicon alloy is obtained after drying, smelting, alloying and heat treatment, wherein each step has a strict logic relationship, and specific process parameters are set in each step. By contrast, the alloy prepared by the traditional casting method has casting defects, and the method for carrying out special heat treatment after smelting and alloying can eliminate dendrite segregation and the like in an as-cast structure, improve the regularity of an ionic electric field, reduce the mean free path in the process of electron movement and improve the heat conductivity. According to the invention, through a great deal of research on the influence trend of the solid solution temperature on the thermal conductivity of the alloy, the optimal solid solution temperature and solid solution time, quenching temperature and quenching time under the conditions of better thermal conductivity and mechanical property are creatively obtained.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
A cast aluminum-silicon alloy with high heat conductivity is composed of the following elements by weight percent: 3.3% of Si, 0.10% of Cu, 0.26% of Mg, 0.08% of Zn, Ti: 0.05%, B: 0.2 percent, the sum of other impurities is not more than 0.02 percent, and the balance is Al.
The preparation method of the cast aluminum-silicon alloy with high heat conductivity comprises the following steps:
1) drying: according to the element composition, selecting pure aluminum ingots with the purity of more than 99.5 percent, Al-Si intermediate alloys, Al-Cu intermediate alloys, magnesium ingots with the purity of more than 99.5 percent, zinc ingots with the purity of more than 99.5 percent and aluminum-titanium-boron refiner as raw materials, and drying the raw materials at the temperature of 100 ℃;
2) smelting: melting a pure aluminum ingot by using a well-type crucible resistance furnace, adding an Al-Si intermediate alloy when the temperature of the pure aluminum liquid reaches 900 ℃, adding the Al-Cu intermediate alloy after the Al-Si intermediate alloy is completely melted, standing for 15-20min after the Al-Cu intermediate alloy is completely melted, adding a magnesium ingot after the magnesium ingot is standing, adding a zinc ingot after the magnesium ingot is completely melted, and standing to obtain an alloy melt after the zinc ingot is completely melted;
3) alloying: when the temperature of the alloy melt is reduced to 750 ℃, adding an aluminum-titanium-boron refiner into the alloy melt, wherein the adding amount of the aluminum-titanium-boron refiner is 0.3 percent of the total weight of the alloy melt, fully stirring, then removing slag by using hexachloroethane for 5min, pouring into a metal mold with the preheating temperature of 200 ℃ when the temperature of the alloy melt is reduced to 720 ℃ for pouring, and obtaining cast aluminum-silicon alloy;
4) and (3) heat treatment: and (3) carrying out solid solution treatment on the cast aluminum-silicon alloy, wherein the solid solution temperature is 500 ℃, the solid solution time is 8 hours, and the cast aluminum-silicon alloy after solid solution is quenched in warm water at 33 ℃, and the quenching time is less than 10 s.
Example 2
A cast aluminum-silicon alloy with high heat conductivity is composed of the following elements by weight percent: 3.9% of Si, 0.3% of Cu, 0.38% of Mg, 0.04% of Zn, Ti: 0.12%, B: 0.12 percent, the sum of other impurities is not more than 0.02 percent, and the balance is Al.
The preparation method of the cast aluminum-silicon alloy with high heat conductivity comprises the following steps:
1) drying: according to the element composition, selecting pure aluminum ingots with the purity of more than 99.5 percent, Al-Si intermediate alloys, Al-Cu intermediate alloys, magnesium ingots with the purity of more than 99.5 percent, zinc ingots with the purity of more than 99.5 percent and aluminum-titanium-boron refiner as raw materials, and drying the raw materials at the temperature of 100 ℃;
2) smelting: melting a pure aluminum ingot by using a well-type crucible resistance furnace, adding an Al-Si intermediate alloy when the temperature of the pure aluminum liquid reaches 850 ℃, adding an Al-Cu intermediate alloy after the Al-Si intermediate alloy is completely melted, standing for 15-20min after the Al-Cu intermediate alloy is completely melted, adding a magnesium ingot after the magnesium ingot is completely melted, adding a zinc ingot after the zinc ingot is completely melted, and standing to obtain an alloy melt;
3) alloying: when the temperature of the alloy melt is reduced to 735 ℃, adding an aluminum-titanium-boron refiner into the alloy melt, wherein the adding amount of the aluminum-titanium-boron refiner is 0.3 percent of the total weight of the alloy melt, fully stirring, then removing slag by using hexachloroethane for 8min, pouring into a metal mold with the preheating temperature of 200 ℃ when the temperature of the alloy melt is reduced to 715 ℃, and pouring to obtain cast aluminum-silicon alloy;
4) and (3) heat treatment: and (3) carrying out solid solution treatment on the cast aluminum-silicon alloy, wherein the solid solution temperature is 520 ℃, the solid solution time is 8 hours, and the cast aluminum-silicon alloy after solid solution is quenched in warm water at 35 ℃, and the quenching time is less than 10 s.
Example 3
A cast aluminum-silicon alloy with high heat conductivity is composed of the following elements by weight percent: 5.5% of Si, 0.4% of Cu, 0.70% of Mg, 0.1% of Zn, Ti: 0.2%, B: 0.05 percent, the sum of other impurities is not more than 0.02 percent, and the balance is Al.
The preparation method of the cast aluminum-silicon alloy with high heat conductivity comprises the following steps:
1) drying: according to the element composition, selecting pure aluminum ingots with the purity of more than 99.5 percent, Al-Si intermediate alloys, Al-Cu intermediate alloys, magnesium ingots with the purity of more than 99.5 percent, zinc ingots with the purity of more than 99.5 percent and aluminum-titanium-boron refiner as raw materials, and drying the raw materials at the temperature of 100 ℃;
2) smelting: melting a pure aluminum ingot by using a well-type crucible resistance furnace, adding an Al-Si intermediate alloy when the temperature of the pure aluminum liquid reaches 880 ℃, adding the Al-Cu intermediate alloy after the Al-Si intermediate alloy is completely melted, standing for 15-20min after the Al-Cu intermediate alloy is completely melted, adding a magnesium ingot after the magnesium ingot is completely melted, adding a zinc ingot after the zinc ingot is completely melted, and standing to obtain an alloy melt;
3) alloying: when the alloy melt is cooled to 720 ℃, adding an aluminum-titanium-boron refiner into the alloy melt, wherein the adding amount of the aluminum-titanium-boron refiner is 0.3 percent of the total weight of the alloy melt, fully stirring, then removing slag by using hexachloroethane for 10min, pouring into a metal mold with the preheating temperature of 200 ℃ when the temperature of the alloy melt is 710 ℃ for pouring, and obtaining cast aluminum-silicon alloy;
4) and (3) heat treatment: and (3) carrying out solid solution treatment on the cast aluminum-silicon alloy, wherein the solid solution temperature is 540 ℃, the solid solution time is 8 hours, and the cast aluminum-silicon alloy after solid solution is quenched in warm water at 37 ℃, and the quenching time is less than 10 s.
Comparative experiment 1
Comparative example 1 cast aluminum-silicon alloy A was prepared in the same manner as in example 1, but without solution treatment0。
Comparative experiment 2: influence of alloy element Si on heat conductivity and mechanical property of cast aluminum-silicon alloy
The preparation method in comparative test 2 is the same as that in examples 1, 2 and 3 (the cast aluminum-silicon alloy is subjected to solution treatment at 500 ℃, 520 ℃ and 540 ℃ respectively for 8 hours, and the cast aluminum-silicon alloy after solution treatment is subjected to quenching treatment in warm water at 33 ℃, 35 ℃ and 37 ℃ respectively for less than 10 s), but the contents of the alloy elements are different and the cast aluminum-silicon alloy consists of the following elements in percentage by weight: 2.5%, 3.3%, 5.5%, 6%, 0.10% of Cu, 0.26% of Mg, 0.08% of Zn, Ti: 0.05%, B: 0.2 percent, the sum of other impurities is not more than 0.02 percent, and the balance is Al.
Comparative experiment 3: influence of alloy element Cu on heat conductivity and mechanical property of cast aluminum-silicon alloy
The preparation method in comparative test 3 is the same as that in examples 1, 2 and 3 (the cast aluminum-silicon alloy is subjected to solution treatment at 500 ℃, 520 ℃ and 540 ℃ respectively for 8 hours, and the cast aluminum-silicon alloy after solution treatment is quenched in warm water at 33 ℃, 35 ℃ and 37 ℃ for less than 10 seconds), but the contents of the alloy elements are different and the cast aluminum-silicon alloy consists of the following elements in percentage by weight: 3.3% of Si, 0% of Cu, 0.1%, 0.4%, 0.5%, 0.6%, 0.26% of Mg, 0.08% of Zn, Ti: 0.05%, B: 0.2 percent, the sum of other impurities is not more than 0.02 percent, and the balance is Al.
Comparative experiment 4: influence of alloy element Mg on heat conductivity and mechanical property of cast aluminum-silicon alloy
The preparation method in comparative test 4 is the same as that in examples 1, 2 and 3 (the cast aluminum-silicon alloy is subjected to solution treatment at 500 ℃, 520 ℃ and 540 ℃ respectively for 8 hours, and the cast aluminum-silicon alloy after solution treatment is quenched in warm water at 33 ℃, 35 ℃ and 37 ℃ for less than 10 seconds), but the alloy elements have different contents and consist of the following elements in percentage by weight: 3.3% of Si, 0.10% of Cu, 0.1% of Mg, 0.26% of Mg, 0.7% of Mg, 0.8% of Zn, 0.08% of Ti: 0.05%, B: 0.2 percent, the sum of other impurities is not more than 0.02 percent, and the balance is Al.
Comparative experiment 5: influence of alloy element Zn on heat conductivity and mechanical property of cast aluminum-silicon alloy
The preparation method in comparative test 5 is the same as in examples 1, 2 and 3 respectively, (the cast aluminum-silicon alloy is subjected to solution treatment at 500 ℃, 520 ℃ and 540 ℃ respectively for 8 hours, and the cast aluminum-silicon alloy after solution treatment is subjected to quenching treatment in warm water at 33 ℃, 35 ℃ and 37 ℃ respectively for less than 10 seconds), but the contents of the alloy elements are different and the cast aluminum-silicon alloy consists of the following elements in percentage by weight: 3.3% of Si, 0.10% of Cu, 0.26% of Mg, 0.02% of Zn, 0.04% of Zn, 0.1% of Zn, 0.2% of Ti: 0.05%, B: 0.2 percent, the sum of other impurities is not more than 0.02 percent, and the balance is Al.
The specific alloy contents of comparative tests 2-5 are shown in Table 1.
TABLE 1 COMPARATIVE TEST 2-5 SPECIFIC ALLOY CONTENT (Wt.%)
The cast aluminium-silicon alloys obtained in the examples and comparative examples were further tested for their properties as follows:
mechanical properties and thermal conductivity:
the cast aluminum-silicon alloys prepared in examples 1 to 3 and the cast aluminum-silicon alloys prepared in comparative experiments 1 to 5 were subjected to room temperature tensile tests (tensile strength and elongation) and thermal conductivity tests (Φ 12.7mm × 5 mm) using samples prepared in accordance with the GB requirements, and the test results are shown in tables 2 to 6.
TABLE 2 cast Al-Si alloys for examples 1-3 and comparative experiment 1
Table 3 comparative test 2 cast aluminium-silicon alloy performance table
TABLE 4 COMPARATIVE TEST 3 CAST ALUMINIUM-SILICON ALLOY PERFORMANCE TABLE
TABLE 5 COMPARATIVE TEST 4 TABLES FOR PERFORMANCE OF CAST ALUMINIUM-SILICON ALLOY
TABLE 6 COMPARATIVE TEST 5 TABLES FOR PERFORMANCE OF CAST ALUMINIUM-SILICON ALLOY
According to the data in the table 2, the thermal conductivity of the high thermal conductivity cast aluminum-silicon alloy of the present invention can reach 172W/(m ∙ k) or more, and can reach 190W/(m ∙ k) at most, and the tensile strength can reach 234.39 MPa or more, and can reach 255.74MPa at most. While the Al-Si alloy in the cast state of comparative example 1 has a thermal conductivity of only 153W/(m ∙ k) and a tensile strength of 188.35 MPa. It can be seen from comparative examples 2 to 5 that the best combination of thermal conductivity and mechanical properties is not achieved when the alloying elements exceed a certain range, but the best combination of thermal conductivity and mechanical properties is achieved only when the contents of Si are 3.3 to 5.5%, Cu is 0.1 to 0.40%, Mg is 0.26 to 0.70%, and Zn is 0.04 to 0.1%. Therefore, when the alloy elements in the cast aluminum-silicon alloy are in a specific range, the thermal conductivity of the invention is obviously improved after heat treatment; in addition, the invention ensures relatively high mechanical property on the premise of ensuring high thermal conductivity of the cast Al-Si alloy, and greatly expands the industrial application range.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910701114.1A CN110387490B (en) | 2019-07-31 | 2019-07-31 | Cast aluminum-silicon alloy with high heat conductivity and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910701114.1A CN110387490B (en) | 2019-07-31 | 2019-07-31 | Cast aluminum-silicon alloy with high heat conductivity and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110387490A CN110387490A (en) | 2019-10-29 |
| CN110387490B true CN110387490B (en) | 2021-04-20 |
Family
ID=68288246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910701114.1A Active CN110387490B (en) | 2019-07-31 | 2019-07-31 | Cast aluminum-silicon alloy with high heat conductivity and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110387490B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455233B (en) * | 2020-05-27 | 2021-11-26 | 东莞市青鸟金属材料有限公司 | High-thermal-conductivity aluminum alloy material and preparation method thereof |
| CN117004851B (en) * | 2023-08-10 | 2025-05-06 | 西安西开精密铸造有限责任公司 | High-conductivity aluminum alloy casting and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107641741A (en) * | 2017-08-30 | 2018-01-30 | 上海帅翼驰铝合金新材料有限公司 | A kind of high heat conduction aluminium alloy |
-
2019
- 2019-07-31 CN CN201910701114.1A patent/CN110387490B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110387490A (en) | 2019-10-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104630576B (en) | Hypoeutectic aluminum-silicon alloy with excellent thermal conductivity, preparation method and application thereof | |
| CN100473735C (en) | High electric-conductivity heat-conductivity high-strength aluminum alloy material, preparation method and application thereof | |
| CN104694805B (en) | Low-cost multi-component heat-resistant magnesium alloy and preparation method of magnesium alloy | |
| CN109652685B (en) | A high thermal conductivity and high corrosion resistance cast aluminum alloy and its preparation method | |
| CN110343916A (en) | High thermal conductivity aluminium alloy suitable for rheo-diecasting and preparation method thereof and forming technology | |
| CN108165842A (en) | A kind of semisolid pressure casting high heat conduction aluminium alloy and its pressure casting method | |
| CN111197132A (en) | Non-heat treatment type high-strength die-casting aluminum alloy and preparation method thereof | |
| CN109972003A (en) | High-elongation heat-resistant aluminum alloy suitable for gravity casting and preparation method thereof | |
| CN111690844B (en) | Eutectic Al-Fe-Mn-Si-Mg die casting alloy and preparation method and application thereof | |
| CN105018812B (en) | A kind of heat resistance magnesium alloy and preparation method thereof | |
| CN113462932B (en) | High-thermal-conductivity aluminum alloy material for semi-solid rheocasting and preparation method thereof | |
| CN108559875B (en) | High-strength heat-resistant aluminum alloy material for engine piston and preparation method thereof | |
| CN108193096A (en) | A kind of hypoeutectic silumin alloy of high-strength and high ductility and preparation method thereof | |
| CN107354349A (en) | A kind of tank body material is with high-performance containing nearly cocrystallized Al-Si alloys of Zn and preparation method thereof | |
| CN111763861A (en) | A kind of high-strength heat-resistant rare earth aluminum alloy and preparation method thereof | |
| CN112921209A (en) | Ultrahigh-heat-conductivity high-plasticity medium-strength aluminum alloy and preparation method thereof | |
| CN112708803B (en) | A kind of high specific modulus aluminum alloy and preparation method thereof | |
| CN110387490B (en) | Cast aluminum-silicon alloy with high heat conductivity and preparation method thereof | |
| CN112941377A (en) | Er-containing cast heat-resistant Al-Si-Cu-Mg alloy | |
| CN116103543A (en) | A kind of recycled high thermal conductivity die-casting aluminum alloy containing rare earth elements and its preparation method | |
| CN102002617A (en) | Cast aluminum alloy for automobile and preparation method thereof | |
| CN102304651B (en) | Casting aluminum-silicon alloy and strengthening method thereof | |
| CN114855036B (en) | High-strength high-thermal-conductivity cast aluminum alloy, preparation method thereof and aluminum alloy product | |
| CN111455246A (en) | A kind of high thermal conductivity magnesium alloy and preparation method thereof | |
| CN111705249A (en) | A kind of high-strength heat-resistant rare earth magnesium alloy and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |